Blood Flow
The first thing blood goes thru when it comes from the body
What is the superior vena cava?
What cells are responsible for the actual pumping of blood?
Contractile Cells
What is happening during the P wave?
Atrial depolarization
What is it considered to have a heart rate below 60 bpm
bradycardia
What is the most inner layer of the heart?
endocardium
T/ F the pulmonary arteries are oxygentated
FALSE
If Na+ is moving into the cell what is happening?
Hint: Depolarization or repolarization
K+ channels open and K+ out leads to what?
repolarization
Which abnormal heart rate is caused by a nonfunctional SA node?
junctional rhythm
What is the formula for calculating stroke volume?
SV= EDV-ESV
Where does gas exchange occur
capillaries
What is the normal heart rate, and what part of the heart is responsible for that?
about 72 and SA node
What does depolarization mean?
contraction
Not getting enough blood or nutrients to the heart cells is called what?
coronary ischemia
Where does the circumflex artery supply blood to?
Left atrium, left ventricle
Name 3 places where blood is deoxygenated
Any of following:
Superior/inferior vena cava, right atria & ventricle, tricuspid valve, pulmonary trunk, pulmonary arteries
If only the AV node fails what is the heart rate? Why
What happens in order to allow the atria to finish contracting and the ventricle to fill?
AV node delay
Which abnormal heart rate has the consequences of decreased cardiac output, hypertension, and dizzyness?
Bradycardia
Where are semilunar valves located?
Between ventricle and vesicle
What does blood go thru when it is leaving the left ventricle?
Aortic semilunar valve
If repolarization (-) moves toward- electrode which way is the reflection
upward
What happens in the QRS complex
Ventricular depolarization down bundle of His, and atrial repolarization
What is the term for a heart attack?
Myocardial infraction
Why can't cardiac contractile cells get tetanus?
contraction period is shorter than refractory